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title: Particle Tracking Software 
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        <h3>Welcome to Three-dimensional Particle Tracking software </h3>
        <p><big>Three dimensional particle tracking velocimetry (3D-PTV) is one
            of velocimetry methods, i.e a technique to measure velocity of
            particles". 3D-PTV is the three-dimensional method, measuring
            velocity and velocity gradients along particle trajectories, i.e. in
            Lagrangian framework, in three dimensions and in time. This is among
            few techniques that can measure objects motion in the fluid flow of
            whatever complexity, three-dimensionality and unsteadiness. It is
            possible to obtain full field of velocity, velocity derivatives
            along with the Lagrangian acceleration and its spatial derivatives
            of higher moments. </big></p>
        <p> </p>
        <ul>
          <li><a href="wiki/an_introduction_to_3d_ptv/index.html">Background -
              what is 3D-PTV?</a>;</li>
          <li><a href="https://github.com/3dptv/3dptv/blob/master/INSTALL.rst">
              How to install 3D-PTV?</a> </li>
          <li><a target="_blank" href="https://github.com/3dptv/3dptv"> How to
              contribute to 3D-PTV? </a> </li>
          <li> <a href="wiki/Documentation_and_manual/index.html">
              Documentation </a> </li>
          <li><a href="wiki/3d_ptv_projects/index.html"> Showcases of the 3D-PTV
              projects </a> </li>
          <li> <a href="http://www.photrack.ch/"> New:
                Professional consulting by Beat Lüthi's startup photrack AG </a>
            </li>
           <li> <a href="wiki/additional_software/index.html"> Additional software and derivative work </a>
            </li>
        </ul>